A feature that I got done in my game, is something I call 'Monster in a Box'. What it allows you to do is purchase Spawn tables for mobs and allow you to target farm items and drops by spending GP. You get a chance to battle Monsters and see if they drop anything. I'm currently working on a sizable database that will have medium sized loot tables for each of these Monster Boxes. Which is a core feature in my grindy game.
Each Monster Box is grouped into ranks, in this order.
PS. Higher Tier Monster Boxes Put a number of Debuffs on you increasing difficulty.